Q. Benzene and toluene form an ideal solution over the entire range of composition. Hie vapour pressure of pure benzene and toluene at $T (K)$ are $50 mm H g$ and $40 mm H g$ respectively. What is the mole fraction of toluene in vapour phase when $117 g$ of benzene is mixed with $46 g$ of toluene ? (molar mass of benzene and toluene are $78$ and $92 g m o l^{- 1}$ respectively)

2090 217 AP EAMCETAP EAMCET 2018 Report Error

0.78

33%

67%

Solution: